1 / 28

Neutrino Program at Rochester

Neutrino Program at Rochester. Kevin McFarland 23 July 2003. Outline. Personnel, etc. NuTeV Next generation oscillation experiments Neutrino cross-sections Phenomenology MINERvA. Timeline. Neutrino program at Rochester is currently between major construction commitments

camden-britt
Télécharger la présentation

Neutrino Program at Rochester

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Neutrino Program at Rochester Kevin McFarland 23 July 2003

  2. Outline • Personnel, etc. • NuTeV • Next generation oscillation experiments • Neutrino cross-sections • Phenomenology • MINERvA Kevin McFarland, Neutrinos at Rochester

  3. Timeline • Neutrino program at Rochester is currently between major construction commitments • Ramp up to future projects well suited to dovetail into end of Run 2 Kevin McFarland, Neutrinos at Rochester

  4. Personnel • No one is currently full-time • Group (mostly senior) currently planning future. • this will have to change soon… Senior PhysicistsStudentsCollaborators Prof. Arie Bodek (25%) Mr. Brian Anderson Prof. Steve Manly (DOE-nucl) Dr. Howard Budd (25%)Mr. Paul Conrow (RET) Prof. Frank Wolfs (NSF-nucl) Prof. Kevin McFarland (25%) Ms. Aimee Slaughter (REU) [Dr. Willis Sakumoto] [Dr. Sergey Avvakumov] [Dr. Pawel deBarbaro] [Dr. Un-Ki Yang] (were ~25% NuTeV) (were 100% CCFR/NuTeV) Senior Research Assoc.UndergraduatesSecondary Teachers Kevin McFarland, Neutrinos at Rochester

  5. Recent Recognition for Work • Prof. Arie Bodek is an acknowledged expert on neutrino cross-section modeling • gave recent NUINT02 summary talk • Prof. Kevin McFarland has given 25 invited seminars and conference presentations on recent NuTeV electroweak result • Thesis awards for our students • Un-Ki Yang FNAL URA Thesis award 2002 (CCFR/NuTeV) • Geralyn Zeller 2003 APS Tanaka prize (NuTeV)(NWU student, de facto advised by McFarland) Kevin McFarland, Neutrinos at Rochester

  6. NuTeV: Electroweak Analysis • Recent three s anomaly in NuTeV sin2qW continues to be a puzzle of interest to community • McFarland (EW Analysis leader), [Zeller, thesis] • McFarland continues activity ininvestigating possible solutions • e.g., recent collaboration withSven-Olaf Moch (DESY) oncalculation of NLO QCD effects(shown to be small, hep-ph/0306052) MW = 80.136  0.084 GeV from Kevin McFarland, Neutrinos at Rochester

  7. NuTeV Students • Avvakumov (Bodek) • first precise measurement ofw/o assuming CP/CPT • test of LSND CPT hypothesis • Yang (Bodek) • CCFR cross-sections, QCDe.g., test of F2 universality • URA thesis award (2002) Kevin McFarland, Neutrinos at Rochester

  8. Status of Neutrino Oscillations • Atmospheric (Super-K) and Solar (SNO, KAMLAND) neutrino oscillation signatures are well established SNO Kamiokande Soudan-2 Super-K MACRO sin22θ> 0.92 Δm2=(1.6 – 3.9)×10-3eV2 Kevin McFarland, Neutrinos at Rochester

  9. Oscillation Phenomenology • Lepton Mixing Matrix has a very different structure than CKM matrix • Big elements (B) are numerically 0.3-0.7 • “?” Element, Ue3, is less than 0.2 • CHOOZ reactor experiment bounds • Theory “bet” is that Ue3 is just around the corner Kevin McFarland, Neutrinos at Rochester

  10. So what about this Ue3? • If Ue3 is non-zero, then phenomenology of neutrino oscillations becomes more rich • CP violation in oscillations à la CKM matrix • Observe matter effects in nmbeam • Sensitive to the hierarchy of neutrino masses instead of just mass-squared differences • If Ue3 is near zero, this is very odd • Will have big impact on GUT models Kevin McFarland, Neutrinos at Rochester

  11. Sign of dm23 d |Ue3| The Importance of Precision P(nm→ne) at Superbeams • Conventional “superbeams” and reactors will be our next windows into Ue3 • Studying this transition in neutrinos and anti-neutrinos gives us magnitude and phase information on Ue3 as well as sign of dm23 • Reactors only measure magnitude of Ue3 Non-trivial phase, d → CP violation Kevin McFarland, Neutrinos at Rochester

  12. How can this be done with Conventional Beams? • Appearance signal is difficult to extract • beam backgrounds • high energy “feed-down” (neutral currents) • Off-axis beam technique makes it possible • Beam becomes monochromatic • Less feed-down • Fewer electron neutrinos Kevin McFarland, Neutrinos at Rochester

  13. J-PARC Neutrino • JAERI 50 GeV PS • 0.77MW initially • 4MW upgrade planned • Extraction point for n beam is being built • Off-axis beam to Super-K detector, near Seoul • At Super-K, L/E~295km/0.7GeV • LOI favorably reviewed by J-PARC PAC • Proposal submitted to Monkasho soon • Actively encouraging non-Japanese collaborators • Physics start date 2008 or 2009? Kevin McFarland, Neutrinos at Rochester

  14. NUMI Off-Axis • NUMI (on-axis) experiment for nm disappearance will commence 2005 • 0.25-0.4 MW proton power • Run 10 km off axis at L/E~700km/2GeV? Other? • LOI submitted to PAC • Proposal to PAC in fall Kevin McFarland, Neutrinos at Rochester

  15. Cross-Sections and Modeling Quasi-elasticsnmn→m-p (x=1, W=Mp) Resonance Region e.g., nmn→m-pp0 (low Q2, W) Deep Inelastic ScatteringnmN→m-X (low Q2, W) • Plausible models exist to describe some aspects of data in each region • Transitions between regions? • A dependence, final-state interactions, etc. Kevin McFarland, Neutrinos at Rochester

  16. n–p0 nn+ Status of Cross-Sections • Not well-known at 1-few GeV • Knowledge of exclusive final states particularly poor • Understanding of backgrounds requires differential cross-sections for these processes! • A dependence? Kevin McFarland, Neutrinos at Rochester

  17. JHF->SK, 0.8MW-yr, 1ring FC m-like (JHFnu LOI) Reconstructed En (MeV) Where do Cross-Sections matter? • nm→nm, dm223, q23 • Signal is suppression in 600-800 MeV bin (peak of beam) • Dominated by non-QE background • 20% uncertainty in non-QE is comparable to statistical error • Non-QE background feeds down from En>Epeak • Quantitatively different for MINOS, NUMI-OA Oscillation with Dm2=3×10-3 sin22q=1.0 Non-QE No oscillation Kevin McFarland, Neutrinos at Rochester

  18. sin22qme=0.05 (sin22qme0.5sin22q13) NUMI 0.7° OA, No NC/ne discrimination (detector indep.) (plot courtesy D. Harris) Where do Cross-Sections matter? • nm→ne, q13 • Shown at right is most optimistic q13; we may instead be fighting against background • NC p0 and beam ne background both in play • NC p0 cross-section poorly known • We can model sCC(ne)/sCC(nm). Is it right? • Precision measurement is the endgame Kevin McFarland, Neutrinos at Rochester

  19. nm nm 50×nm 5×nm Where do Cross-Sections matter? NUMI 0.7° OA, 3.8E20 POT • nm→ne vs nm→ne, d • Cross-sections very different in two modes • “Wrong sign” background only relevant in anti-neutrino • Crucial systematic in comparing neutrino to anti-neutrino • Need sCC(n)/sCC(n) in sub- to few-GeV region Kevin McFarland, Neutrinos at Rochester

  20. Q2= 0.22 GeV2 Q2= 0.07 GeV2 Q2= 1. 4 GeV2 Q2= 0.85 GeV2 Q2= 3 GeV2 Q2= 9 GeV2 Phenomenology I: Bodek-Yang Duality • The problem: transition between DIS and resonance region • High precision neutrino DIS data (e.g., CCFR & NuTeV) is available • Precise low Q2 charged lepton data (JLab, SLAC) in resonance region • Quark-Hadron Duality? • “When you get near a resonance, it sucks you in.” • Bodek and Yang have shown that charged lepton resonance data can be described “on average” with a DIS-like cross-section • Currently being implemented in standard n generators • NUANCE (Super-K, IMB), NUGEN (MINOS) Kevin McFarland, Neutrinos at Rochester

  21. Phenomenology II: Revisiting Quasi-Elastics • Strategy: • charged lepton data (lots of it) used to determine vector form factors • small amount of neutrino quasi-elastic data used to measure axial form-factors within dipole model • previous neutrino analyses used too simple a cross-section model cross-section ratio, before and after Bodek-Budd-Arrington • Bodek, Budd and Arrington (Argonne) have re-analyzed old neutrino data with more sophisticated vector form factors • result is a large shift in the effective axial mass • this has solved a major problem for K2K Q2 distributions • again, being implemented in standard generators Kevin McFarland, Neutrinos at Rochester

  22. Rochester Involvement inJ-PARC neutrino • We have begun an involvement in the J-PARC neutrino project • McFarland has served on International Board since 2002 • McFarland is 280m (near) detector co-convenor • Our primary interest is in construction of near detectors to measure flux and neutrino cross-sections • plays well into our CDF/CMS/NuTeV detector strengths • leading the field in cross-section modeling (Bodek, Budd, Yang) • Current activities • tests of aqueous liquid scintillator for cross-section on Oxygen(Conrow, Slaughter, McFarland, Wolfs) • detector simulation/optimization (Anderson, McFarland) Kevin McFarland, Neutrinos at Rochester

  23. MINERvA: Main INjector ExpeRiment n-A • The J-PARC neutrino beam may not achieve operating intensity until 2009 • but NUMI beamline available ~2005 • beamline off and on-axis allows for a broad range of neutrino energies accessible in existing NUMI tunnels on-axis 5m off-axis NUMI ME NUMI LE 10m 5m off-axis 15m on-axis 15m 10m event rate per unit detector mass as a function of neutrino energy Kevin McFarland, Neutrinos at Rochester

  24. MINERvA Detector • Want a fully active detector to see, e.g., recoil protons from mn–p • Segmented scintillator strips with WLS readout for the basis of the detector • heavy FNAL investment in this technology • lots of Rochester experience! (CDF plug, CMS HCAL) • Cost driver may be photosensors • evaluating MAPMTs, APDs, Image Intensifiers/CCDs Kevin McFarland, Neutrinos at Rochester

  25. n MINERvA Detector • Modular design • Construct above ground piecewise • Can add detector or target material as another layer Active/passive frame around target Active scintillator strip target Kevin McFarland, Neutrinos at Rochester

  26. Next Steps for MINERvA • Two EOIs submitted to FNAL PAC in 2002 • one to sit in on-axis and one in off-axis beams • merger is MINERvA, initially to run on-axis(C. Keppel, McFarland, J. Morfin scientific coordinators) • Will submit a proposal to fall 2003 PAC • physics case, detector conceptual design, cost estimate Kevin McFarland, Neutrinos at Rochester

  27. Collaborations with Nuclear Physics • Neutrino cross-sections and oscillations are also of interest to the nuclear physics community • Prof. Steve Manly (DOE nucl) • proposals at JLab to study inclusive and exclusive resonance cross-sections on nuclei • crucial input for neutrino cross-sections • Bodek, McFarland signed on as collaborators • collaborator on MINERvA • Prof. Frank Wolfs (NSF nucl.) • development of Aqueous scintillator Kevin McFarland, Neutrinos at Rochester

  28. Conclusions • Current successes in analysis (NuTeV) and phenomenology • as well as detector building skills at Rochester • We want to build on these strengths to seed a new generation of neutrino oscillation andcross-section experiments • we see a unique role for Rochester in developing, building and analyzing near detector data, ultimately to be applied to neutrino oscillations • next step: MINERvA • Bridge between particle and nuclear physics Kevin McFarland, Neutrinos at Rochester

More Related